CODEWITHSUNDEEP
androidopencv
user2062340
user2062340

Reputation: 73

How to add Point to MatOfPoint2f?

My goal is to calculate the fundamental Matrix by using the matching keypoints from two images. Now I got the good matching points:

MatOfDMatch matches = new MatOfDMatch();
matcher.match(descriptor1,descriptor2, matches);

List<DMatch> matchesList = matches.toList();
List<DMatch> good_matches = new ArrayList<DMatch>();
org.opencv.core.Point pt1;
org.opencv.core.Point pt2;

//Then I definite good_dist here
//....


for(int i =0;i<matchesList.size(); i++)
 {
  if(matchesList.get(i).distance<good_dist)
  {
     good_matches.add(matchesList.get(i));
     pt1 = keypoints1.toList().get(matchesList.get(i).queryIdx).pt; 
     pt2 = keypoints2.toList().get(matchesList.get(i).trainIdx).pt;
  }
}

Now I want to pass the pt1 and pt2 to MatOfPoint2f in order to call the function:

Calib3d.findFundamentalMat(pt1, pt2, Calib3d.FM_8POINT);

Does anyone know what should I do? Thanks in advance!

Upvotes: 4

Views: 3080

Answers (2)

roylewilliam
roylewilliam

Reputation: 35

So we effectively start with List<DMatch> good_matches. You then want to add your pt1 and pt2 Point objects to lists inside of your "(matchesList.get(i).distance<good_dist)" if statement, as in List<org.opencv.core.Point>. We then have

List<DMatch> good_matches;
List<org.opencv.core.Point> points1;
List<org.opencv.core.Point> points2;

We then convert the lists of points to MatOfPoint2f as follows:

org.opencv.core.Point goodPointArray1[] = new org.opencv.core.Point[goodKeyPoints1.size()];
goodKeyPoints1.toArray(goodPointArray1);
MatOfPoint2f keypoints1Mat2f = new MatOfPoint2f(goodPointArray1);

I am sure more efficient ways of doing this exist, and I would love to hear them

Upvotes: 0

user1755546
user1755546

Reputation: 1049

Create Array of point (array_point) and do next:

MatOfPoint2f yourArray_of_MatofPoint2f= new MatOfPoint2f(array_point);

This is from Java, if this doesn't work, please post.

Upvotes: 4

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